Im not blaming only the mp3... im blaming the factor "money" .
Look...if an excelent artist release a cd with his own style of music, and the cd don´t sell, next time he will produce a more "pop" one in order to get more feedback in the sales. With people downloading every single cd, they have to start making more "pop" trance in order to spread the music into a larger scale and get some money into the pocket.
Afcourse there´s many artists that don´t do it for the money...maybe only a few nowadays.